/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h
Returns the RelativePathFromMount Filename for every Filename found in the Iostore Container that relates to the provided block indexes
static void GetFilenamesFromIostoreByBlockIndex ( const [FString](API\Runtime\Core\Containers\FString) & InContainerName, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & InBlockIndex, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & OutFileList )